Rainbow Electronics DS2756 - Manual (Page 5)

DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
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Figure 2. Functional Diagram
1-WIRE
INTERFACE
AND
ROM ID
VOLTAGE
REFERENCE
THERMAL
SENSE
ADC
DQ
VIN
PRECISION
TIMEBASE M
U
X
S
+ -
chip ground
SNS
IS2
VSS
IS1
VDD
PIO
BIAS
Low Power
Oscillator
LOCKABLE EEPROM
BLOCKS
SRAM
TEMPERATURE
VOLTAGE
CURRENT
ACCUM. CURRENT
COMPARATORS
STATUS / CONTROL
10K W 10K W
DETAILED PIN DESCRIPTION
Pin Name Description
1 VIN
Battery Voltage-Sense Input. Voltage measurement performed on VIN input and
displayed in Voltage Register.
2 VSS
Device Ground and Current-Sense Resistor Connection. VSS attaches to battery end of
sense resistor.
3 PIO General-Purpose Programmable I/O Pin or Optional Interrupt Output
4 VDD Input Supply: +3.0V to +5.5V Input Range. Bypass VDD to VSS with 0.1 mF.
5 IS1 Current-Sense Filter Input 1
6 IS2 Current-Sense Filter Input 2
7 SNS Sense Resistor Connection. SNS attaches to pack end of current sense resistor.
8 DQ
Serial Interface Data I/O Pin. Bidirection data transmit and receive at 16kbps or 143kbps.
Optional interrupt output.